An alphanumeric sequencer was a device primarily used in engineering of Intrepid-class starships, used to decipher garbled communications and enable visual contact.

In 2372, Captain Kathryn Janeway tried to contact a duplicated USS Voyager, created by a subspace divergence field, but had no success. However, the other Voyager had been able to lock on to their counterpart's frequency via a rotating band pulse sent by chief engineer B'Elanna Torres. Janeway had Torres run the communications frequency into an alphanumeric sequencer, which then allowed the two crews to talk to each other via a viewscreen. (VOY: "Deadlock")

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